The present invention provides a reinforcing fiber, a flexible concrete prepared using the reinforcing fiber and a method for preparing the concrete. The reinforcing fibers of the present invention comprises a polyester fiber as a core for improving tensile strength; an alkali-resistant material coated over the polyester fiber having profiled surface; an active agent coated on the alkali- resistant polymer material for better dispersion of the said reinforcing fiber in the concrete/mortar. The reinforcing fibers in the flexible concrete improve the flexibility, continuity and strength of the concrete.
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